Consolidated Balance Sheets [Parenthetical] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Securities held-to-maturity, fair value (in dollars)	$ 16,379	$ 9,293
Allowance for loan losses	$ 15,805	$ 16,008
Common stock, par value (in dollars per share)	$ 0.835	$ 0.835
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	20,534,163	10,636,242
Common stock, shares outstanding	20,534,163	10,636,242